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Content preview: Oops, I forgot to include a link to the OpenSSL GH issue,
which describes the specific commit that made the change: https://github.com/openssl/openssl/issues/29340
On Mon, Dec 8, 2025 at =?UTF-8?Q?2:02=E2=80=AFPM?= Jack O'Connor wrote: > > Upgrading OpenSSL
from v3.5 to v3.6 causes a ~3x slowdown for > `sha256sum` (~2x for `sha1sum`)
on machines that support SHA-NI. It > looks [...]
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Oops, I forgot to include a link to the OpenSSL GH issue, which
describes the specific commit that made the change:
https://github.com/openssl/openssl/issues/29340
On Mon, Dec 8, 2025 at 2:02=E2=80=AFPM Jack O'Connor <oconnor663@HIDDEN>=
wrote:
>
> Upgrading OpenSSL from v3.5 to v3.6 causes a ~3x slowdown for
> `sha256sum` (~2x for `sha1sum`) on machines that support SHA-NI. It
> looks like this was caused by a change in why/how
> `OPENSSL_cpuid_setup` gets called.
>
> I don't know who's "to blame" or what the proper fix will be, but as a
> hacky example here's a patch that fixes the performance regression in
> `sha256sum` by calling `OpenSSL_add_all_algorithms` early in `main`:
>
> diff --git a/src/cksum.c b/src/cksum.c
> index ac3e3f1..c7c20f0 100644
> --- a/src/cksum.c
> +++ b/src/cksum.c
> @@ -52,6 +52,9 @@
> #if HASH_ALGO_SHA256 || HASH_ALGO_SHA224 || HASH_ALGO_CKSUM
> # include "sha256.h"
> #endif
> +#if HASH_ALGO_SHA256 && HAVE_OPENSSL_SHA256
> +# include <openssl/evp.h>
> +#endif
> #if HASH_ALGO_SHA512 || HASH_ALGO_SHA384 || HASH_ALGO_CKSUM
> # include "sha512.h"
> #endif
> @@ -1505,6 +1508,10 @@ main (int argc, char **argv)
> so that processes running in parallel do not intersperse their outp=
ut. */
> setvbuf (stdout, nullptr, _IOLBF, 0);
>
> +#if HASH_ALGO_SHA256 && HAVE_OPENSSL_SHA256
> + OpenSSL_add_all_algorithms();
> +#endif
> +
> #if HASH_ALGO_SUM
> char const *short_opts =3D "rs";
> #elif HASH_ALGO_CKSUM
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: "Jack O'Connor" <oconnor663@HIDDEN> Subject: bug#79972: Acknowledgement (`sha256sum` performance regression in OpenSSL v3.6) Message-ID: <handler.79972.B.176525789622488.ack <at> debbugs.gnu.org> References: <CA+6di1k8AhmDxfxLCthW_auz1iMokx6w_1eTuzE+4xZWn4cqtw@HIDDEN> X-Gnu-PR-Message: ack 79972 X-Gnu-PR-Package: coreutils Reply-To: 79972 <at> debbugs.gnu.org Date: Tue, 09 Dec 2025 05:25:03 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 79972 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 79972: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D79972 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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From: Collin Funk <collin.funk1@HIDDEN>
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Hi Jack and Samuel,
"Jack O'Connor" <oconnor663@HIDDEN> writes:
> Oops, I forgot to include a link to the OpenSSL GH issue, which
> describes the specific commit that made the change:
> https://github.com/openssl/openssl/issues/29340
>
> On Mon, Dec 8, 2025 at 2:02=E2=80=AFPM Jack O'Connor <oconnor663@HIDDEN=
m> wrote:
>>
>> Upgrading OpenSSL from v3.5 to v3.6 causes a ~3x slowdown for
>> `sha256sum` (~2x for `sha1sum`) on machines that support SHA-NI. It
>> looks like this was caused by a change in why/how
>> `OPENSSL_cpuid_setup` gets called.
>>
>> I don't know who's "to blame" or what the proper fix will be, but as a
>> hacky example here's a patch that fixes the performance regression in
>> `sha256sum` by calling `OpenSSL_add_all_algorithms` early in `main`:
Thanks for both reports and for the debugging.
I commented on the OpenSSL bug what I think is happening here. The low
level deprecated OpenSSL functions will not call OPENSSL_cpuid_setup
like the EVP ones will. OpenSSL 3.5 would call OPENSSL_cpuid_setup when
the library was loaded, but OpenSSL 3.6 will not.
We use the low-level deprecated APIs, e.g., SHA256_Init, SHA256_Update,
and SHA256_Final, because the EVP APIs are overkill for our purposes. If
my understanding is correct, that means OpenSSL 3.6 never checks what
instructions your CPU supports.
>> diff --git a/src/cksum.c b/src/cksum.c
>> index ac3e3f1..c7c20f0 100644
>> --- a/src/cksum.c
>> +++ b/src/cksum.c
>> @@ -52,6 +52,9 @@
>> #if HASH_ALGO_SHA256 || HASH_ALGO_SHA224 || HASH_ALGO_CKSUM
>> # include "sha256.h"
>> #endif
>> +#if HASH_ALGO_SHA256 && HAVE_OPENSSL_SHA256
>> +# include <openssl/evp.h>
>> +#endif
>> #if HASH_ALGO_SHA512 || HASH_ALGO_SHA384 || HASH_ALGO_CKSUM
>> # include "sha512.h"
>> #endif
>> @@ -1505,6 +1508,10 @@ main (int argc, char **argv)
>> so that processes running in parallel do not intersperse their out=
put. */
>> setvbuf (stdout, nullptr, _IOLBF, 0);
>>
>> +#if HASH_ALGO_SHA256 && HAVE_OPENSSL_SHA256
>> + OpenSSL_add_all_algorithms();
>> +#endif
>> +
>> #if HASH_ALGO_SUM
>> char const *short_opts =3D "rs";
>> #elif HASH_ALGO_CKSUM
Thanks, this patch is on the right track. Mine covers the rest of the
programs that use OpenSSL.
I'll hold off pushing and watch the OpenSSL bug report, since I think
this change was unintentional.
diff --git a/src/cksum.c b/src/cksum.c
index ac3e3f10e..e4d548079 100644
--- a/src/cksum.c
+++ b/src/cksum.c
@@ -67,6 +67,7 @@
=20
/* The official name of this program (e.g., no 'g' prefix). */
#if HASH_ALGO_SUM
+# define OPENSSL_INIT()
# define PROGRAM_NAME "sum"
# define DIGEST_TYPE_STRING "BSD"
# define DIGEST_STREAM sumfns[sum_algorithm]
@@ -74,6 +75,14 @@
# define DIGEST_BITS 16
# define DIGEST_ALIGN 4
#elif HASH_ALGO_CKSUM
+# if (HAVE_OPENSSL_MD5 || HAVE_OPENSSL_SHA1 || HAVE_OPENSSL_SHA256 || \
+ HAVE_OPENSSL_SHA512 || HAVE_OPENSSL_SHA3)
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define MAX_DIGEST_BITS 512
# define MAX_DIGEST_ALIGN 8
# define PROGRAM_NAME "cksum"
@@ -83,6 +92,13 @@
# define DIGEST_BITS MAX_DIGEST_BITS
# define DIGEST_ALIGN MAX_DIGEST_ALIGN
#elif HASH_ALGO_MD5
+# if HAVE_OPENSSL_MD5
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "md5sum"
# define DIGEST_TYPE_STRING "MD5"
# define DIGEST_STREAM md5_stream
@@ -90,6 +106,7 @@
# define DIGEST_REFERENCE "RFC 1321"
# define DIGEST_ALIGN 4
#elif HASH_ALGO_BLAKE2
+# define OPENSSL_INIT()
# define PROGRAM_NAME "b2sum"
# define DIGEST_TYPE_STRING "BLAKE2b"
# define DIGEST_STREAM blake2b_stream
@@ -97,6 +114,13 @@
# define DIGEST_REFERENCE "RFC 7693"
# define DIGEST_ALIGN 8
#elif HASH_ALGO_SHA1
+# if HAVE_OPENSSL_SHA1
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "sha1sum"
# define DIGEST_TYPE_STRING "SHA1"
# define DIGEST_STREAM sha1_stream
@@ -104,6 +128,13 @@
# define DIGEST_REFERENCE "FIPS-180-1"
# define DIGEST_ALIGN 4
#elif HASH_ALGO_SHA256
+# if HAVE_OPENSSL_SHA256
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "sha256sum"
# define DIGEST_TYPE_STRING "SHA256"
# define DIGEST_STREAM sha256_stream
@@ -111,6 +142,13 @@
# define DIGEST_REFERENCE "FIPS-180-2"
# define DIGEST_ALIGN 4
#elif HASH_ALGO_SHA224
+# if HAVE_OPENSSL_SHA256
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "sha224sum"
# define DIGEST_TYPE_STRING "SHA224"
# define DIGEST_STREAM sha224_stream
@@ -118,6 +156,13 @@
# define DIGEST_REFERENCE "RFC 3874"
# define DIGEST_ALIGN 4
#elif HASH_ALGO_SHA512
+# if HAVE_OPENSSL_SHA512
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "sha512sum"
# define DIGEST_TYPE_STRING "SHA512"
# define DIGEST_STREAM sha512_stream
@@ -125,6 +170,13 @@
# define DIGEST_REFERENCE "FIPS-180-2"
# define DIGEST_ALIGN 8
#elif HASH_ALGO_SHA384
+# if HAVE_OPENSSL_SHA512
+# include <openssl/crypto.h>
+# define OPENSSL_INIT() OPENSSL_init_crypto (OPENSSL_INIT_ADD_ALL_CIPHERS=
, \
+ nullptr)
+# else
+# define OPENSSL_INIT()
+# endif
# define PROGRAM_NAME "sha384sum"
# define DIGEST_TYPE_STRING "SHA384"
# define DIGEST_STREAM sha384_stream
@@ -1505,6 +1557,8 @@ main (int argc, char **argv)
so that processes running in parallel do not intersperse their output=
. */
setvbuf (stdout, nullptr, _IOLBF, 0);
=20
+ OPENSSL_INIT ();
+
#if HASH_ALGO_SUM
char const *short_opts =3D "rs";
#elif HASH_ALGO_CKSUM
Collin
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